Steam boiler



. STEAM BOILER Filed Dec. 127J 1924 ATTORNEYS.

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Patented Dec. 22, 1925.

"UNITED STATES PATENT OFFICE.

i CHRISTOPHER SAMUEL DA'VY AND CHRISTOPHER HI'JIPHREY DAVY, OF BECKEN- HAM, ENGLAND, ASSIGNORS TO THE BAIBCOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY', A CORPORATION OF NEW JERSEY.

STEAM BOILER.

Application filed December 27, 1924. Serial No. 758,363.

To all 'whom t may concern:

Be it known that we, CHRISTOPHER SAM- UEL DAVY and CHRISTOPHER I-IUMPHREY DAVY, subjects of the King of Great Britain, residing at 72 The Avenue, Beckenham, Kent, England, respectively, have invented certain new and useful Improvements in Steam Boilers, of which the following is a specification.

Our present invention relates to steam boilers, particularly those having a plurality of banks of horizontal water tubes with the banks disposed one above the other.

In the arrangement illustrated in the drawing, a lower bank of horizontally inclined water tubes 10 is connected to uptake headers 11 and downtake headers 12. Above the uptake headers 11 is positioned a steam and water drum 13 having a steam outlet 14, and above the downtake headers 12 is positioned a steam and water drum 15. Above the tubes 10` is positioned a superheater 16 which may be of any desired form. Above the bank of tubes 10 is an upper bank 17 of horizontally inclined water tubes, the tubes 17 being inclined in the opposite direction from that of the tubes 10. Downta-ke headers 18 and uptake headers 19 are connected to the ends of the tubes 17, the tubes 17 preferably being shorter than the tubes 10.

Steam and water circulating tubes 2O counect the drums 14 and 15 at or just above the water level therein, and a water inlet pipe 21 enters the drum 13.

The headers 18 are connected by a row of nipples 22 with the drum 13, and the uptake headers 19 are connected by a row of nipples 23 with the drum 15.

The down take headers 12 of the lower bank are connected by a row of tubes 24 with the drum 15 and the uptake headers 11 are connected by a row of tubes 25 to the drum 15, the tubes 25 preferably extending approximately to the center of the drum 15. It will be noted that t-he tubes 25 lirst extend upward directly vertical, and then with a large bend extend in an inclined position above the tubes 10 and the superheater 16 and across the path of the gases passing upward from the tubes 10, and finally in a vertical direction into the drum 15. v

In operation, each bank of tubes has a separate circulating system connected, however, through the common drum 15. The

feed water entering the drum 13 though the pipe 21 first flows downward through the nipples 22, thence through the tubes 17 to the drum 15 and from thence through the tubes 2O back to the drum 13. Similarly water from the drum 15 which, of course, has been heated in its passage through the tubes 17, Hows down through the tubes 24 and then up through the tubes 10, and finally up through the tubes 25 back to the druln 15.

By this arrangement a definite circulation through each part of a multi-bank boiler is insured, and, at the same time, notwithstanding the long connections between the lower bank and the upper drum 15, a positive circulation is insured, because not only is the water and steam rising through the tubes 25, by reason of the heating in the tubes 10, but by passing the tubes 25 through the hot gases, it will be obvious that there can be no possibility of a cooling and retardation of flow in the tubes 25. Moreover, the steam formed in the tubes 10 will be separated from the water in the drum 15 and will pass through the circulating tubes 20 into the drum 13 which, of course, is cooler because of the entrance of the feed water. Consequently the separation of water from the steam passing out of the outlet 14 is effectively carried out.

1. In a water tube boiler, a first steam and water drum having a steam outlet, a second steam and water drum, tubes connecting said drums and arranged to conduct steam and water therebetween, a lower bank of horizontally inclined water tubes having their ends connected to said second drum, an upper bank of horizontally inclined Water tubes above said lower bank and having their uptake ends connected to said second drum and their downtake ends connected to said iirst drum, and a water supply connected to said first drum.

2. In a water tube boiler, a first steam and water drum having a steam outlet, a second steam and water drum, said drums being disposed at the front and the rear of the boiler, respectively, tubes connecting said drums and arranged to conduct steam and water therebetween, a lower bank of horizontally inclined water tubes having their downtake ends beneath said second drum Aund*tubes; cunectng said ends with said drums, gtubes connecting the uptake endsof said `Water tubes with said second Vdrum and Y expanding labove said Water tubes in@` generarllyfljlpwarld "eli'reetov in the path of the l gases dxerefipnu',V ah' upper bank ofY Water tubeskabove'vsad lower bank and'h'aving `their uptake endsbeneath'sad Second drum,

LCubes conectng the uptakey ends ofV Ythe Water .tubes ofsadupperlbank with said secondidrum and tubes connecting the downtake-ends of said Waterubes of said upper ply eonnected to said first drum.'

. CHRISTOPHER SAMUEL DAVY. 

